Country, Middle East, southwestern Asia. Area: 636,374 sq mi (1,648,200 sq km). Population (2005 est.): 69,515,000. Capital: Tehrān. Persians constitute about one-third of its population; other ethnic groups include Azerbaijanians, Kurds, Lurs, Bakhtyārī, and Baloch. Languages: Persian (Farsi; official), numerous others. Religions: Islam (official; predominantly Shī&ayn;ite); also Zoroastrianism. Currency: rial. Iran occupies a high plateau, rising higher than 1,500 ft (460 m) above sea level, and is surrounded largely by mountains. More than half of its surface area consists of salt deserts and other wasteland. About one-tenth of its land is arable, and another one-fourth is suitable for grazing.
Iran's rich petroleum reserves account for about one-tenth of world reserves and are the basis of its economy. It is an Islamic republic with one legislative house and several oversight bodies dominated by clergy. The head of state and government is the president, but supreme authority rests with the rahbar, a ranking cleric. Human habitation in Iran dates to some 100,000 years ago, but recorded history began with the Elamites &circa; 3000 &BC;. The Medes flourished from &circa; 728 but were overthrown in 550 by the Persians, who were in turn conquered by Alexander the Great in the 4th century &BC;. The Parthians (&see; Parthia) created an empire that lasted from 247 &BC; to &AD; 226, when control passed to the Sāsānian dynasty. Various Muslim dynasties ruled from the 7th century. In 1501 the &Ssubdot;afavid dynasty was established and lasted until 1736. The Qājār dynasty ruled from 1796, but in the 19th century the country was economically controlled by the Russian and British empires. Reza Khan (&see; Reza Shah Pahlavi) seized power in a coup (1921). His son Mohammad Reza Shah Pahlavi alienated religious leaders with a program of modernization and Westernization and was overthrown in 1979; Shī&ayn;ite cleric Ruhollah Khomeini then set up an Islamic republic, and Western influence was suppressed. The destructive Iran-Iraq War of the 1980s ended in a stalemate. Since the 1990s the government has gradually moved to a more liberal conduct of state affairs.
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